Preheat oven to 375°F. Lightly grease a sheet pan with olive or avocado oil.
In a food processor, add chickpeas, shallot, garlic, cilantro, cilantro, salt, cumin, coriander, lemon zest, cayenne pepper, and oat flour. Pulse until coarse and uniform with some texture. The mixture should be sticky and holding together. (Don't over-process the mixture or you’ll have hummus.)
Scoop about 2 tablespoons of mixture out and form into patties. You should get 12 or 13 small patties. Place on your baking sheet.
Bake 10-12 minutes on the first side then flip and bake for another 10-12 minutes. They should be lightly browned.
For serving
Place whole lettuce leaf on a plate, top with lettuce, falafel, onions, tomatoes, tzatziki, and hummus. Serve immediately